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(2*x-30)/100 = 170 // - 170
(2*x-30)/100-170 = 0
(2*x-30)/100+(-170*100)/100 = 0
2*x-170*100-30 = 0
2*x-17030 = 0
(2*x-17030)/100 = 0
(2*x-17030)/100 = 0 // * 100
2*x-17030 = 0
2*x-17030 = 0 // + 17030
2*x = 17030 // : 2
x = 17030/2
x = 8515
x = 8515
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